Making use of postman-request, an HTTP client:


var request = require('postman-request');
var fs = require('fs');


var proxyRequest = request.defaults({
    'proxy': 'http://<API KEY>:@proxy.crawlera.com:8010'
});

var options = {
    url: 'https://twitter.com',
    ca: fs.readFileSync("/path/to/crawlera-ca.crt"),
    requestCert: true,
    rejectUnauthorized: true
};

function callback(error, response, body) {
    if (!error && response.statusCode == 200) {
        console.log(response.headers);
        console.log(body);
    }
    else{
        console.log(error, response, body);
    }
}

proxyRequest(options, callback);


Crawlera Certificate Authority can be downloaded here: crawlera-ca.crt.